81707021002 has 16 divisors (see below), whose sum is σ = 127898707392. Its totient is φ = 39074381280.

The previous prime is 81707020999. The next prime is 81707021041. The reversal of 81707021002 is 20012070718.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 646102 + ... + 762142.

It is an arithmetic number, because the mean of its divisors is an integer number (7993669212).

Almost surely, 2^81707021002 is an apocalyptic number.

81707021002 is a deficient number, since it is larger than the sum of its proper divisors (46191686390).

81707021002 is a wasteful number, since it uses less digits than its factorization.

81707021002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131373.

The product of its (nonzero) digits is 1568, while the sum is 28.

The spelling of 81707021002 in words is "eighty-one billion, seven hundred seven million, twenty-one thousand, two".